Abstract Body (Do not enter title and authors here): Introduction:
Multisociety guidelines in secondary atherosclerotic cardiovascular disease (ASCVD) cholesterol goals have evolved over time. We aim to identify temporal trends in low density lipoprotein cholesterol (LDL-c) and statin use in a post coronary artery bypass grafting (CABG) population.

Methods:
This is a retrospective study of Kaiser Permanente Northern California members who underwent CABG from 2008 to 2019. Patients were stratified according to three time frames (2008-2013, 2014-2018, 2019) based on the release of multisociety guidelines in 1999, 2013 and 2018. LDL-c goal was defined as a last available value less than 70 mg/dL at 1 year follow up. Lipid lowering therapies were identified through pharmacy records. Cox proportional hazard modeling was used to identify major adverse cardiovascular event (MACE) free survival at up to 12 years follow up.

Results:
The cohort included 6422 patients, mean age 64.9 years, 83% male, with baseline LDL-c 95.9 mg/dL. Of the cohort, 47% of patients achieved an LDL-c < 70 mg/dL at 1-year follow up. Of the stratified groups, the 2019 cohort demonstrated the highest attainment of LDL-c goal (65%, N=392) compared to 2008-2013 cohort (41%, N=1197) and 2014-2018 cohort (57%, N=1406) (Table 1). A relative increase in high dose statin monotherapy and a decrease in low/moderate dose statin monotherapy was temporally demonstrated in recent cohorts. There was a positive correlation between increasing year and attainment of LDL-c goal (R2=0.916) (Figure 1). Attainment of LDL-c <70 at 1 year post CABG was associated with higher MACE free survival (log-rank p=0.057).

Conclusions:
Recent cholesterol guidelines post ASCVD have a stronger emphasis on specified LDL-c goals which is associated with increased attainment of LDL-c <70 and improved MACE free survival in our post CABG patients.